Lego Indiana Jones: The Original Adventures Cheats

In the game, there are some star wars charachter in some places please find all five and tell me what happens coz i havent done it yet coz i dont knowe where the 5th person is

Enter the following codes on the blackboard in the Math classroom at Barnet College.

Enter in the class of the university oxford and writhe the codes with chalk

To unlock the three extra levels you need to beat a certain amount of levels with all artifacts found

You enter codes at Barnett College. It's the 2nd door on the left in the main hallway.
You still have to buy characters unlocked this way, you just get access to them.
Cheats that are unlocked this way are ready to go, they can be turned on from the pause menu.

Enter the following codes on the blackboard in the Math classroom at Barnet College.